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Battery charging system for motor-generator

  • US 5,115,183 A
  • Filed: 11/09/1990
  • Issued: 05/19/1992
  • Est. Priority Date: 11/13/1989
  • Status: Expired due to Fees
First Claim
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1. A battery charging system for motor-generator mounted on an electric vehicle, said vehicle having a battery, a motor provided to drive an axle of said vehicle depending on the electric energy supplied from said battery, a generator connected to said battery, an engine provided to drive said generator for charging said battery, engine speed changing means for variably changing an engine speed, generator speed detecting means for detecting a generator speed and for generating a generator speed signal indicative thereof and battery terminal voltage sensing means for sensing a battery terminal voltage and for generating a battery terminal voltage signal indicative thereof, said system comprising:

  • charge setting means responsive to said battery terminal voltage signal for discriminating a condition where the battery should be charged;

    engine driving means for driving said engine only while said condition is discriminated by said charge setting means;

    target generator speed setting means for setting a target speed of said generator while said charge setting means discriminates said condition and for generating a target speed signal indicative thereof; and

    engine speed control means responsive to said generator speed signal and said target speed signal for actuating said engine speed changing means to control the engine speed in the manner that said generator speed converges to said target speed.

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